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Sunday Afternoon Maths III

 Posted on 2014-03-09 

Twenty

How many three digit integers are there for which the product of the digits is 20?

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Tags: numbers

Colliding parallel people

If two people stand 1km apart and walk in the same direction, how far will the have to walk until they collide due to the curvature of the Earth? (diameter of Earth = 12,742km)

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If you enjoyed these puzzles, check out Sunday Afternoon Maths LXVII,
puzzles about factorials, or a random puzzle.

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Sunday Afternoon Maths LXVII

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